Device with means for avoiding the condensation of water in cans filled with sliver

ABSTRACT

A device with a drafting device ( 3 ) for drafting at least one sliver (FB) supplied to the drafting device ( 3 ) comprises a sliver depositing apparatus ( 4 ) downstream from the drafting device ( 3 ) for depositing the drafted sliver (FB′) into a can ( 6 ). Furthermore, the device comprises a can replacement device ( 15 ) for replacing a filled can ( 6 ′) by a can ( 6 ) to be filled. Means ( 17 ) is provided on the device for lowering the temperature (T) and/or the relative moisture (LF) of the fibrous material (FB, FB′) before or after it is deposited in the can ( 6 ). Furthermore, means ( 17 ) for raising the temperature T U  of the machine parts ( 13, 20 ) that make contact with the uppermost sliver layers (BL) in the filled can ( 6 ′) can be provided, with which means ( 17 ) a condensation of water on the cited machine parts ( 13, 20 ) is at least reduced. A combination of a card ( 1 ) with a drafting device ( 3 ) comprises a sliver depositing apparatus ( 4 ), downstream from the drafting device ( 3 ), for depositing the drafted sliver (FB′) into a can ( 6 ) as well as comprises a can replacement device ( 15 ). During the replacement of a filled can ( 6 ′) by a can ( 6 ) to be filled the filled can ( 6 ′) is pushed from the filling position ( 18 ) to an adjacent ejection position ( 19 ). No machine part ( 13, 20 ) covering and touching the uppermost sliver layers (BL) is provided in the ejection position ( 19 ) in order to avoid a condensation of water.

The present invention relates to a device with a drafting device fordrafting at least one sliver supplied to the drafting device. The devicecomprises a sliver depositing apparatus downstream from the draftingdevice for depositing the drafted sliver into a can as well as comprisesa can replacement device for replacing a filled can with a can to befilled. The filled can is pushed from the filling position to anejection position.

There is the danger in traditional devices with a drafting device,conditioned by strong temperature differences in the course of thedrafting of at least one sliver, that after the sliver has beendeposited in the can the moisture contained in the air and/or in thesliver condenses in the can.

As a result of the compression of the fibrous material on parts of thedrafting device and friction on the roller pairs, the temperature of thefibrous material sharply rises when running through the drafting device.The fibrous material is subsequently deposited into a ready can. The canis pushed into an ejection position after it has been filled, where thefibrous material is relaxed and a high degree of sliver fungus is thusavoided. During the relaxing the moisture contained in the fibrousmaterial evaporates into the air contained in the can. The uppermostsliver layers of the fibrous material deposited in the can make contactwith the machine parts covering the can, so that the space inside thecan is largely closed. When the air contained in the can meets thesemachine parts, which as a rule have a lower temperature, the air coolsoff so that the relative moisture of the air rises. If the air reachesthe saturation limit (dew-point curve or saturation line in a statediagram (Mollier diagram) for moist air), a condensation of water occurson the cited machine parts. This has the result that the moisturecollects on these machine parts, from which it drips onto the fibrousmaterial deposited in the can and thoroughly moistens it, which resultsin significant disturbances in the further processing.

Furthermore, devices with a drafting device that fill rectangular cansare known in the state of the art. These filled cans are directlyejected without a relaxation phase so that a condensation of themoisture contained in the fibrous material does not occur on adjacentmachine parts here. However, these devices have the disadvantage thatthe filling amount of the can must be more sharply limited on account ofthe high band fungus produced.

If another sliver-producing apparatus, e.g., a card, is connected infront of the drafting device, the fibrous material has an elevatedtemperature at the drafting input already. The temperature of thefibrous material at the exit from the drafting is consequently alsohigher so that the danger of condensation of the moisture contained inthe deposited sliver is especially great in this instance.

The present invention has the problem of creating a device with adrafting device that largely prevents in a simple manner a condensationof water on machine parts covering the cans.

This problem is solved by the features of the independent claims.

The invention relates to devices with a drafting device as well as tocombinations of such devices with other equipment producing sliver. Adevice with a drafting device for drafting at least one sliver suppliedto the drafting device comprises a sliver depositing apparatus arrangeddownstream from the drafting device for depositing the resulting,drafted sliver into a can. Furthermore, the device contains a canreplacement device for replacing a filled can by a can to be filled. Thefilled can is pushed from the filling position to an ejection position.According to the invention means are provided on the device for loweringthe temperature and/or the relative moisture of the fibrous materialbefore or after its deposition in the can. In addition to or alsoinstead of these means, means can be provided that raise the temperatureof the machine parts that make contact with the uppermost sliver layersin the filled can located in the exit position. Accordingly, means forraising the temperature of the machine part are provided on a machinepart in accordance with the invention, e.g., a plate of the carrierframe which plate contacts the uppermost sliver layers. To this end themachine part can comprise, e.g., a heating installation, especially aheating foil.

The state of the air located in the can or the state of the environmentor of the adjacent machine parts can be varied in such a manner by themeans of the invention that a condensation of water or on the machineparts in contact with the uppermost sliver layers is at least partiallyreduced. This means in the presentation of these means in a statediagram that the saturation line or dew-point curve is no longer droppedbelow during the change of state of the moist air in the can during therelaxation. The means of the invention can be provided individually oralso in combination with each other so that the state of the air presentin the can as well as the state of the environment can be changed andthus a dropping below the dew-point curve can be prevented in an evenmore reliable manner. This can largely prevent the condensation of thewater contained in the moist air. The means for lowering the temperatureand/or the relative moisture of the fibrous material can be providedbefore or after the depositing of the fibrous material in the can.

If the means for lowering the temperature and/or the relative moistureof the fibrous material are arranged after the drafting device theinvention can be implemented in an especially simple manner. Inparticular, these means can be readily retrofitted on traditionaldevices.

If a sliver-producing apparatus, in particular a card, is connected infront of the drafting device which apparatus directly supplies anindividual sliver to the drafting device without an intermediatedepositing, the temperature difference between the air temperature inthe can and the ambient temperature is especially large so that thedanger of a condensation of water on machine parts is increased. Themeans in accordance with the invention can be used especiallyeffectively in such a device.

The means in accordance with the invention can also be used especiallyadvantageously if the device is designed as a draw frame with a card infront of it as sliver-producing apparatus. Moreover, the use of thismeans in a compound machine consisting of a drafting device and asliver-producing apparatus is advantageous.

An advantageous embodiment of the invention provides that the means forincreasing the temperature of said machine parts comprises at least oneheating apparatus. The temperature of the machine parts can be raised bythe heating apparatus in such a manner that this temperature and thusthe point of the state of the air after cooling off is raised over thedew-point curve in the state diagram for moist air. During the coolingoff of the air contained in the can from its initial state to theambient temperature when meeting the cited machine parts the dew-pointcurve is therefore no longer dropped below and a condensation of wateris thus prevented.

It is advantageous if the heating apparatus comprises at least oneheating foil. The temperature of the machine parts in contact with theuppermost sliver layers can be increased in an especially simple mannerwith such a heating foil.

In order to be able to operate the heating apparatus in an especiallyeconomical and energy-saving manner, it is advantageous if thetemperature of said machine parts can be controlled or regulated by theheating apparatus.

It is especially advantageous if the heating apparatus is arrangedbetween a plate of the carrier frame and the machine part that isdesigned in an areal manner and makes contact with the uppermost layersof the sliver. This makes it possible to heat in an energy-saving manneronly the layer that makes contact with the fibrous material and/or theair in the can. This can avoid a flow-off of heat via the plate of thecarrier frame into the carrier frame.

The machine part in contact with the uppermost layers of the sliver ispreferably designed as a sliding sheet, e.g. in the form of anoble-steel plate or a ceramic plate. It is also advantageous if themachine part is designed as a coating or some other covering of thecarrier frame plate. This significantly facilitates the shifting of thefilled cans from the filling position into an ejection position sincethe uppermost sliver layers can slide along the sliding sheet.

Another advantageous further development of the invention provides thatat least one passage opening that communicates with the ambient air isprovided in the machine part that contacts the uppermost layers of thesliver. As a result, moisture can escape from the can during cooling offand a state of equilibrium of the air in the can with the ambient air isadjusted that is between the state of the air in the can and that of theambient air. This state of equilibrium is also above the dew-pointcurve, given appropriate parameters of the ambient air, in the statediagram so that this also makes it possible to avoid a condensation ofwater.

It is furthermore advantageous is the passage opening is connected to anapparatus for supplying room air or conditioned air, e.g., from an airconditioning unit, in the inner space of the can. This makes possible animproved dehumidifying and cooling off of the air in the can. Ifappropriately conditioned air is brought into the inner space of the canvia the apparatus the state of equilibrium that is adjusted can bereliably brought above the dew-point curve, even if the ambient air hasunfavorable climatic conditions, e.g., elevated air moisture ortemperature.

A machine part in accordance with the invention with a passage openingcan be attached in an especially simple manner to the device or to thecarrier frame plate. No changes to the device or to the can replacementdevice are required for this but rather only a replacing of thecorresponding machine part is required. Likewise, such a passage openingcan also be added subsequently to a traditional carrier frame plate orto an appropriate machine part, which can reduce problems caused bycondensation in an especially simple and economical manner.

Another advantageous embodiment of the invention provides that the meansfor lowering the temperature and/or the relative moisture of the fibrousmaterial before it is deposited in the can comprises at least onecooling apparatus. A cooling of the fibrous material is possible in thisinstance in front of, in and/or after the drafting device. The initialstate of the air in the can be changed in such a manner by such acooling apparatus that when the air meets adjacent machine parts thedew-point curve is also not dropped below.

The cooling apparatus advantageously cooperates with a structuralcomponent that makes contact with the fibrous material during operationof the device. As a result of the contact, the cooling of the fibrousmaterial can take place in an especially efficient and energy-savingmanner.

It is especially advantageous if the cooling apparatus is arranged on asliver forming unit downstream from the drafting device in which unitthe drafted fibers material is combined to a sliver. Consequently, theconstruction expense for such a cooling apparatus can be kept especiallylow. It is especially advantageous in this connection if the coolingapparatus is designed for supplying a gas or gaseous mixture that iscooler than the ambient temperature through bores or slits of the sliverforming unit. The cooling agent can be introduced through the bores orslits in an especially simple manner into the inner space of the sliverforming unit through which the fibrous material passes.

Another advantageous further development of the invention ischaracterized in that the cooling apparatus is arranged between thesliver-producing apparatus and the drafting device. The temperature ofthe sliver can be significantly lowered as a result already at theentrance into the drafting device.

It is also advantageous if the cooling apparatus comprises one or morePeltier elements. These can be used to cool defined areas, such as, inparticular, structural components in contact with the fibrous materialor the drafted sliver.

A combination in accordance with the invention of a card with a draftingdevice for drafting at least one sliver supplied to the drafting devicedirectly from the card comprises a sliver depositing apparatusdownstream from the drafting device for depositing the resulting draftedsliver into a can. Moreover, the combination in accordance with theinvention comprises a can replacement device for replacing a filled canwith a can to be filled, which filled can is pushed from the fillingposition to an adjacent replacement position. According to the inventionno machine part covering and contacting the uppermost sliver layers isprovided in the ejection position. As a consequence, an exchange of theair in the can with the ambient air is made possible so that after acompensation procedure a thermodynamic state of equilibrium is alsoadjusted that is above the dew-point curve.

Other advantages of the invention are described using the followingexemplary embodiments.

FIG. 1 shows a schematic view of a combination of a sliver-producingapparatus with a following draw frame.

FIG. 2 shows a schematic top view onto a can replacement apparatus atthe end of a draw frame.

FIG. 3 shows a schematic state diagram for moist air with a change ofstate of the air contained in the can as well as its change by the meansof the invention.

FIGS. 4, 4 a shows an embodiment of the invention with a heatingapparatus and a corresponding state diagram.

FIGS. 5, 5 a shows an alternative embodiment of means in accordance withthe invention for avoiding a condensation of water and shows acorresponding state diagram.

FIGS. 6, 6 a show another embodiment of means in accordance with theinvention with an apparatus for supplying room air or conditioned air aswell as a corresponding state diagram.

FIGS. 7, 7 a show an alternative embodiment of the invention with acooling apparatus for cooling fibrous material and show a correspondingstate diagram.

FIG. 8 shows an insert for a fleece guidance nozzle in a sliver formingunit with bores for cooling the fibrous material.

FIG. 1 schematically shows a combination of a sliver-producing apparatuswith downstream draw frame 2 comprising drafting device 3. In thepresent instance a known card 1 (not described in detail) is connectedin in front of draw frame 2. In the compound machine shown a sliver FBcontained in card 1 is transported directly into drafting device 3 whereit is drafted, then conducted through sliver forming apparatus 5 anddeposited via depositing apparatus 4 into can 6.

FIG. 2 shows a schematic top view onto can replacement apparatus 15 onthe end of draw frame 2. Empty cans 6 are supplied to draw frame 2 on aslanting gravity roller conveyor 16. Empty cans 6 are pushed from rotarypusher into filling position 18 in which sliver FB′ is deposited in can6. After the set filling amount has been achieved, full can 6′ is pushedout into ejection position 19. Can 6′ is filled here at first over itsedge with fibrous material FB′ in order to achieve a maximum filling. Inorder to relax and reduce the filling height, can 6′ remains in ejectionposition 19 for a few minutes until it is finally ejected after thesetting of fibrous material FB′. The uppermost sliver layers BL ofsliver FB′ in the can and projecting over the can edge are in contactwith plate 13 of carrier frame 23 directly or via an additional machinepart 20, e.g., a sliding sheet, so that fibrous material FB′ slidesalong these parts 13, 20 during the ejection.

A condensation of water in filled cans 6′ frequently occurs intraditional draw frames 2, especially in compound machines, conditionedby temperature changes in the course of the production process, which isexplained in more detail with FIG. 1. Sliver FB produced in card 1leaves card 1 with temperature T_(KA) and is supplied via deflectionroller 7 to subsequent draw frame 2. The temperature T_(KA) is usuallysignificantly higher than ambient temperature T_(U). Sliver FB cools offslightly in the ambient air so that it has entrance temperature TE atfeed funnel 8 on the entrance of draw frame 2. Feeler device 9 forsliver FB is arranged after feed funnel 8 for compressing sliver FB.Feeler device 9 is formed by two feeler rollers that compress enteringsliver FB. One of the two feeler rollers is movably supported and istherefore deflected to a greater or lesser degree by fluctuations involume of entering sliver FB. After having run through feeler device 9the now compressed fiber entanglement FB is conducted into draftingdevice 3. As a result of differing circumferential speeds of roller pair11 of drafting device 3, fiber entanglement FB is drafted in accordancewith the ratio of the circumferential speeds.

The compressing of sliver FB on the feeler rollers and the draftingbring about an elevation of temperature of sliver FB so that draftedsliver FB′ has exit temperature T_(A) upon leaving drafting device 3that is higher than entrance temperature T_(E) and significantly higherthan ambient temperature T_(U). As a result of the evaporation of themoisture contained in the fibrous material the air in the inner hollowspace 12 of deposited sliver FB′ after the depositing of the sliver hascan temperature T_(K) and relative moisture LF_(K).

If the air located in can 6 with temperature T_(K) and a relativemoisture LF_(K) meets adjacent machine parts 13, 20 with the ambienttemperature T_(U), e.g., a carrier frame plate 13 covering cans 6,during the relaxation phase, there is a danger of a condensation of themoisture contained in the air and/or in the fibrous material incorresponding devices of the state of the art. This has the consequencethat water collects on the condensation surface, in this instance onplate 13, drips onto the fibrous material FB′ deposited in can 6′ andthoroughly moistens it.

A corresponding change of state of the air contained in can 6′ isschematically shown in a state diagram for moist air (Mollier diagram)according to FIG. 3. The diagram shows temperature T and relative airmoisture LF as a function of the absolute water content x. The air incan 6′ has at first temperature T_(K) in state Z1 and relative moistureLF_(K) that are above dew-point curve TL with 100% air moisture. When itmeets adjacent machine parts 13, 20 with temperature T_(U) the airexperiences a cooling off (state Z2), represented here by an arrow,during which water condenses when dew-point curve TL is dropped below.Means are provided in a device in accordance with the invention thatchange state Z1 of the air in can 6′ and/or the state of the environmentor of the adjacent machine parts 13, 20 in such a manner that upon achange of state of the moist air from Z1′ to Z2′ the dew-point curve TLis not dropped below. This can largely prevent a condensation of water.According to the invention the corresponding means 17 can provide anelevation of temperature of ambient temperature T_(U) to T_(U)′ or alowering of temperature T_(K) or of relative moisture LF_(K) of the airin can 6′ which changes can take place before or after the depositing ofsliver material FB′ into can 6. Any combinations of corresponding means17 are also possible. In the present instance a change of all magnitudesof state are shown and both points Z1, Z2 are shifted to points Z1′,Z2′. This prevents a dropping below dew-point curve TL during thecooling off. However, means 17 in accordance with the invention can alsoprovide only a dehumidifying of the air in the can so that state pointZ1 is isothermally shifted into state point Z1′ (not shown here). It isalso conceivable to shift initial state Z1 of the air contained in thecan onto a line of constant relative moisture. It is furthermorepossible to provide means 17 that make a compensation with the ambientair possible so that a thermodynamic equilibrium results in state Z2″,as is explained in detail in FIG. 5.

An embodiment of the invention in accordance with FIG. 4 provides thatheating device 21 is arranged on carrier frame plate 13 covering cans 6or on machine part 20 contacting uppermost sliver layers BL. In thepresent instance carrier frame plate 13 is provided with a sliding sheeton its side facing cans 6, 6′ in order to a ensure a smooth transport ofcans 6, 6′ in can replacement device 15. Heating foil 22 that can beelectrically heated with voltage source 24 is attached between carrierframe plate 13 and the sliding sheet in the area of ejection position 19as heating apparatus 21. Temperature T_(U) can be purposefully raisedonly in the area of ejection position 19 by a heating foil 22 arrangedin such a manner, which makes an economical operation of the devicepossible. However, it is just as possible to heat the entire slidingsheet or carrier frame plate 13. Temperature T_(U) of machine parts 13,20 covering cans 6′ is raised by heating apparatus 21 so that even statepoint Z2 is raised to state point Z2′, as is shown in the state diagramof FIG. 4 a. Therefore, upon the change of state of the air contained incan 6′ from Z1 to Z2′ when it meets machine parts 13, 20 dew-point curveTL is no longer dropped below and a condensation of the moisturecontained in the air is largely prevented. This can also prevent anentering of moisture into adjacent machine parts and prevent consequentcorrosion damage so that this embodiment of the invention is especiallyadvantageous in constricted spatial conditions, e.g., in a compoundmachine.

If heating apparatus 21 is provided with a control-or regulating unit(not shown here) it can be operated in a particularly energy-saving andeconomical manner. To this end a sensor for temperature detection can bearranged on machine parts 13, 20.

FIG. 5 shows another embodiment of the invention in which passageopenings are provided in machine parts 13, 20 covering cans 6, 6′ asmeans 17 for lowering the relative moisture and the temperature offibrous material FB′ in can 6′. One or more openings are arranged inmachine parts 13, 20 that communicate with the ambient air and via whichmoisture can escape from can 6′. The ambient air has temperature T_(U)and relative air moisture LF_(U) in this instance, which air moistureLF_(U) is significantly below the relative moisture of the air locatedin the can (FIG. 5 a). On the other hand, the air in can 6′ hastemperature T_(K) above ambient temperature T_(U) and has relative airmoisture LF_(K) at state point Z1. The passage opening makes acompensation procedure possible between these two states Z1 and ZU sothat a thermodynamic equilibrium is adjusted in state Z2″. Conditionedby the different temperatures and moistures, this state point Z2″ isabove the dew-point curve, so that a condensing out of water is alsolargely prevented. Z2 shows the state here that the air in can 6′ wouldassume after a change of state without means 17 in accordance with theinvention.

Another embodiment of the invention (not shown) provides that no machinepart 13, 20 or one covering the cans only partially is provided at leastin ejection position 19. Even this makes possible a compensationprocedure possible between state Z1 of the air in the can and state ZUof the environment. However, the entering of moisture into adjacentstructural components must be avoided here.

The condensing of water and the thorough wetting of fibrous material FB′in can 6′ can be suppressed in an especially effective manner if thepassage openings are connected to an apparatus 25 for supplying room airor conditioned air, as FIG. 6 shows. If a current of air is introducedby this apparatus 25 into the interior of can 6′ an improved removal ofmoisture from fibrous material FB′ and an improved cooling becomepossible by the circulation of the air in can 6′ (see arrow). The aircurrent can be introduced for this purpose, e.g., via a blower;appropriately conditioned air, e.g., from an air conditioning unit, canalso be introduced in particular in hot countries where air moisture orthe temperature of the ambient air is comparatively high. This can holdstate of equilibrium Z2″ reliably above the dew-point curve (FIG. 6 a).By way of comparison, Z2 shows the state which the air in can 6′ wouldattain without the compensation procedure.

FIG. 7 shows another embodiment of the invention in which means 17 forlowering the temperature and/or the relative moisture of fibrousmaterial FB′ comprise cooling apparatus 27. Cooling apparatus 27 cancool fibrous material FB′ before it is deposited in can 6′ before, in orafter drafting device 3. In the present instance cooling apparatus 27 isarranged in front of drafting device 3 so that the temperature T_(E) offibrous material FB is lowered before its entrance into drafting device3 already. This is especially advantageous if a sliver-producingapparatus is connected in front of drafting device 3 or draw frame 2 andtherefore entrance temperature T_(E) is comparatively high. Furthermore,even the formation of windings on the drafting device rollers can beavoided by a lower entrance temperature T_(E) and the resulting lowertemperature during the drafting. In spite of an elevation of temperatureof fibrous material FB in drafting device 3, a condensation of themoisture still contained in fibrous material FB′ or in the air is not tobe expected, conditioned by the lower temperature difference relative toambient temperature T_(U). A dehumidification of fibrous material FBtakes place conditioned by the lower absorption capacity for moisture ofthe cooler air before it is deposited in the can already so that theinitial state of the air in the can is shifted into state point Z1′(FIG. 7 a). Therefore, given an appropriate change of state (see arrow)of the air into state Z2, the dew-point curve is also not dropped below.An especially reliable shifting of point Z1 into point Z1′ can beachieved if cooling apparatus 27 also brings about a dehumidification offibrous material FB in addition to the lowering of the temperature. Anappropriate cooling apparatus 27 can of course also be arranged in orafter drafting device 3.

An especially efficient cooling of fibrous material FB can be achievedif cooling apparatus 27 cooperates with a structural component in directcontact with fibrous material FB. To this end, e.g., rollers 11 ofdrafting device 3 can be cooled or cooling apparatus 27 is arranged onsliver forming unit 5. Insert 28 for a fleece guidance nozzle (notshown) in a sliver forming unit 5, which insert makes possible thesupplying of a cooling agent, is shown in FIG. 8. In sliver forming unit5 fibrous material FB′ coming out of drafting device 3 is formed to asliver in a fleece guidance nozzle with an insert 28 (sliver funnel).Insert 28 comprises flow openings 29 a, 29 b emptying into inner space30 of insert 28 and of sliver forming unit 5. Fibrous material FB′passes through this inner space 30 so that an especially effective andconstructively simple cooling of fibrous material FB′ can take place viaopenings 29 a, 29 b. Conditioned air or also some other suitable gas,e.g., nitrogen, can be used for cooling.

The invention is not limited to the exemplary embodiments shown.Numerous modifications of the invention and especially combinations arepossible within the scope of the claims.

1. A device with a drafting device (3) for drafting at least one sliver(FB) supplied to the drafting device (3), with a sliver depositingapparatus (4) downstream from the drafting device (3) for depositing theresulting, drafted sliver (FB′) into a can (6) as well as with a canreplacement device (15) for replacing a filled can (6′) with a can to befilled (6), which filled can (6′) is pushed from the filling position(18) to an ejection position (19), characterized by means (17) forlowering the temperature (T) and/or the relative moisture (LF) of thefibrous material (FB, FB′) before or after it is deposited in the can(6) and/or by means (17) for raising the temperature (T_(U)) of themachine parts (13, 20) that make contact with the uppermost sliverlayers (BL) in the filled can (6′) in the ejection position (19), withwhich a condensation of water on the cited machine parts (13, 20) is atleast reduced.
 2. The device according to the previous claim,characterized in that a sliver-producing apparatus, in particular a card(1), is connected in front of the drafting device (3) which apparatusdirectly supplies an individual sliver (FB) to the drafting device (3)without an intermediate depositing.
 3. The device according to one ofthe previous claims, characterized in that it is designed as a drawframe (2) and that the sliver-producing apparatus is a card (1)connected in front.
 4. The device according to one of the previousclaims, characterized in that it comprises the drafting device (3) andthe sliver-producing apparatus, in particular a card (1).
 5. The deviceaccording to one of the previous claims, characterized in that the means(17) for lowering the temperature (T) and/or the relative moisture (LF)of the fibrous material (FB, FB′) is arranged after the drafting device(3).
 6. The device according to one of the previous claims,characterized in that the means (17) for raising the temperature ofthese machine parts (13, 20) comprises at least one heating apparatus(21) by means of which the temperature (T_(U)) of the machine parts (13,20) can be raised in such a manner that the state point (Z2) of the airin the state diagram for moist air (Mollier diagram) is raised above thedew-point curve (TL).
 7. The device according to one of the previousclaims, characterized in that the heating apparatus (21) comprises atleast one heating foil (22).
 8. The device according to one of theprevious claims, characterized in that the temperature of these machineparts (13, 20) can be controlled or regulated by the heating apparatus(21).
 9. The device according to one of the previous claims,characterized in that the heating device (21) is arranged between aplate (13) of the carrier frame (23) and said machine part (20), that isdesigned in an areal manner and makes contact with the uppermost layers(BL) of the sliver (FB′).
 10. The device according to one of theprevious claims, characterized in that the machine part (20) is designedas a sliding sheet, e.g. in the form of a noble-steel plate or a ceramicplate, as a coating or as some other covering of the carrier frame plate(13).
 11. The device according to one of the previous claims,characterized in that at least one passage opening communicating withthe ambient air is provided in the machine part (13, 20).
 12. The deviceaccording to one of the previous claims, characterized in that at leastone passage opening is provided in the machine part (13, 20) whichopening is connected to an apparatus (25) for supplying room air orconditioned air, e.g., from an air conditioning unit, into the interiorof the can.
 13. The device according to one of claims 1 to 4,characterized in that the means (17) for lowering the temperature and/orthe relative moisture of the fibrous material before it is deposited inthe can (6) comprises at least one cooling apparatus (27) that iscapable of cooling the fibrous material (FB, FB′) before, in and/orafter the drafting device (3).
 14. The device according to one of theprevious claims, characterized in that the cooling apparatus (27)cooperates with a structural component that makes contact with thefibrous material (FB, FB′) during operation of the device.
 15. Thedevice according to one of the previous claims, characterized in thatthe cooling apparatus (27) is arranged on a sliver forming unit (5)connected in after the drafting device (3) in which the drafted fibrousmaterial is combined to a sliver (FB′).
 16. The device according to oneof the previous claims, characterized in that the cooling apparatus (27)is designed for supplying a gas or gaseous mixture that is cooler thanthe ambient temperature (T_(U)) through bores (29 a, 29 b) or slits ofthe sliver forming unit (5) into its inner space (30) through which thefibrous material (FB′) passes.
 17. The device according to one of theprevious claims, characterized in that the cooling apparatus (27) isarranged between the sliver-producing apparatus, in particular a card(1), and the drafting device (3).
 18. The device according to one of theprevious claims, characterized in that the cooling apparatus (27)comprises one or more Peltier elements.
 19. A machine part (20),especially a carrier frame plate (13), of a device with a draftingdevice (3), a sliver depositing apparatus (4) for depositing a sliver(FB′) drafted in the drafting device (3) into a can (6) as well as witha can replacement device (15) for replacing a filled can (6′) with a canto be filled (6), which filled can (6′) is pushed from the fillingposition (18) to an ejection position (19), which machine part (13, 20)makes contact with the uppermost sliver layers (BL) of the filled can(6′) in the ejection position (19), characterized in that means (17) forraising the temperature (T_(U)) of the machine part (13, 20) is providedwith which a condensation of water on the machine part (13, 20) is atleast reduced.
 20. The machine part (13, 20) according to the previousclaim, characterized in that a heating apparatus (21) is arranged on themachine part (13, 20) as means (17) for raising the temperature T_(U) ofthe machine part (13, 20).
 21. The machine part (13, 20) according tothe previous claim, characterized in that the heating apparatus (21)comprises a heating foil (22).
 22. The machine part (20) according toone of claims 19 to 21, characterized in that the machine part (20) thatmakes contact with the uppermost sliver layers (BL) is a sliding plateor a covering arranged on the carrier frame plate (13).
 23. The machinepart (20) according to one of claims 19 to 22, characterized in that theheating apparatus (21) is arranged between the machine part (20), thatmakes contact with the uppermost sliver layers (BL), and the carrierframe plate (13).
 24. A machine part (20), in particular a carrier frameplate (13), of a device with a drafting device (3), a sliver depositingapparatus (4) for depositing a sliver (FB′) drafted in the draftingdevice (3) into a can (6) as well as with a can replacement device (15)for replacing a filled can (6′) with a can to be filled (6), whichfilled can (6′) is pushed from the filling position (18) to an ejectionposition (19), which machine part (13, 20) makes contact with theuppermost sliver layers (BL) of the filled can (6′) in the ejectionposition (19), characterized in that at least one passage opening isarranged in the machine part (13, 20) in order to lower the temperature(T) and/or the relative moisture (LF) of the sliver (FB′) and to preventthe condensation of water on the machine part (13, 26).
 25. The machinepart (20) according to the previous claim, characterized in that thepassage opening communicates with the ambient air.
 26. The machine part(20) according to claim 24, characterized in that the passage opening isconnected to an apparatus for supplying room air or conditioned air. 27.A combination of a card (1) with a drafting device (3) for drafting atleast one sliver (FB) supplied to the drafting device (3) directly fromthe card (1), with a sliver depositing apparatus (4) downstream from thedrafting device (3) for depositing the resulting, drafted sliver (FB′)into a can (6) as well as with a can replacement device (15) forreplacing a filled can (6′) with a can to be filled (6), which filledcan (6′) is pushed from the filling position (18) to an adjacentejection position (19), characterized in that no machine part (13, 20)covering and touching the uppermost sliver layers (BL) is provided inthe ejection position.